Set TX Power problem

[Patrick Spousta]

Hi,
when I tried to setup tx power I got error

iwconfig wlan0 txpower 160
Error for wireless request "Set Tx Power" (8B26) :
     SET failed on device wlan0 ; Operation not supported.

My configuration is
- HW is ZComax XI-626
- part of dmesg output
wlan0: NIC: id=0x8013 v1.0.0
wlan0: PRI: id=0x15 v1.1.1
wlan0: STA: id=0x1f v1.5.6
wlan0: Intersil Prism2.5 PCI: mem=0xebfff000, irq=10
- hostap-driver version 0.1.3
- wireless-tools version 26+27pre21-1
- kernel 2.4.23

Do anybody know where is a problem?

Thanks
Patrick